MathematicsMedium179×since 2002Q4197Let f : R →\to→ R be a function defined by f(x) = max {x, x²}. Let S denote the set of all points in R, where f is not differentiable. Then :A{0, 1}B{0}Cϕ\phiϕ(an empty set)D{1}Check answerSkip